/* Copyright 2019 Istio Authors. All Rights Reserved.
 *
 * Licensed under the Apache License, Version 2.0 (the "License");
 * you may not use this file except in compliance with the License.
 * You may obtain a copy of the License at
 *
 *    http://www.apache.org/licenses/LICENSE-2.0
 *
 * Unless required by applicable law or agreed to in writing, software
 * distributed under the License is distributed on an "AS IS" BASIS,
 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
 * See the License for the specific language governing permissions and
 * limitations under the License.
 */

#pragma once

#include <string>

namespace Envoy {
namespace Utils {

// Zipkin B3 headers
const std::string kTraceID = "x-b3-traceid";
const std::string kSpanID = "x-b3-spanid";
const std::string kParentSpanID = "x-b3-parentspanid";
const std::string kSampled = "x-b3-sampled";

const std::set<std::string> TracingHeaderSet = {
    kTraceID,
    kSpanID,
    kParentSpanID,
    kSampled,
};

} // namespace Utils
} // namespace Envoy
